01665nas a2200217   4500008004100000022001400041245011800055210006900173260011000242300001200352490000700364520079600371100002501167700002101192700001701213700002501230700001801255700002701273700002201300856012501322       2012                        eng d  a0959-942800aTuning spectral properties of phenothiazine based donor-pi-acceptor dyes for efficient dye-sensitized solar cells0 aTuning spectral properties of phenothiazine based donorpiaccepto  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a889-8940 v223 a<p>Two novel metal-free organic donor-pi-acceptor dyes were synthesized using electron-rich 10-butyl-(2-methylthio)-10H-phenothiazine as a donor and cyanoacrylic acid as an acceptor. The spectral response of the dye was tuned by introducing a vinylene thiophene pi-bridge. Obtained optical and electrochemical properties of the dyes seemed to be promising in terms of employing them as light harvesters in dye-sensitized solar cells (DSCs). The efficiencies of the devices under standard AM 1.5G (100 mW cm(-2)) conditions reached 7.3% with volatile electrolyte. The differences in the photovoltaic parameters of these DSCs were explained by comparing the results of electrochemical impedance spectroscopy (EIS) measurements and transient photovoltage and photocurrent decay experiments.</p>1 aMarszalek, Magdalena1 aNagane, Satyawan1 aIchake, Amol1 aHumphry-Baker, Robin1 aPaul, Vincent1 aZakeeruddin, Shaik, M.1 aGraetzel, Michael  uhttps://library.ncl.res.in/content/tuning-spectral-properties-phenothiazine-based-donor-pi-acceptor-dyes-efficient-dye-001988nas a2200217   4500008004100000022001400041245011300055210006900168260011000237300001400347490000600361520112000367100002501487700002101512700001701533700002501550700001801575700002701593700002101620856012901641       2013                        eng d  a2046-206900aStructural variations of D-pi-A dyes influence on the photovoltaic performance of dye-sensitized solar cells0 aStructural variations of DpiA dyes influence on the photovoltaic  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR  a7921-79270 v33 a<p>Two new organic D-pi-A dyes containing identical pi-conjugated spacer and anchoring/acceptor moieties but different donor groups were designed and synthesized. These dyes containing didodecylcyclopentadithiophene (CPDT) as a spacer, cyanoacrylic acid as an acceptor and N-butyl-carbazole or N-butyl-phenothiazine moieties as electron donor groups are labelled as V4 and V11 dyes, respectively. The variation in the donor group of these two dyes, that influences the photophysical, electrochemical and photovoltaic parameters, was investigated. The highest photovoltaic conversion efficiency of 7.5% was obtained with V4 dye at AM 1.5 G full sunlight intensity (100 mWcm(-2)). Comparison of phenothiazine donor dyes with two different pi-conjugated spacers, CPDT (V11) and vinyl thiophene (V7) containing devices shows that the V-oc of V7 dye is lower than that of V11 due to the downward shift of the conduction band edge. Transient photovoltage and electrochemical impedance spectroscopy measurements were performed to explain the differences in the PV parameters by varying the donors and/or spacer groups.</p>1 aMarszalek, Magdalena1 aNagane, Satyawan1 aIchake, Amol1 aHumphry-Baker, Robin1 aPaul, Vincent1 aZakeeruddin, Shaik, M.1 aGratzel, Michael  uhttps://library.ncl.res.in/content/structural-variations-d-pi-dyes-influence-photovoltaic-performance-dye-sensitized-solar-0